package com.beijing.syn;

/**
 * @Author Ma Wenqi
 * @Date 2021/3/27 18:09
 * @Version 1.0
 */
public class UnsafeBank {
    public static void main(String[] args) {
        Account account = new Account(100, "基金");
        Drawing you = new Drawing(account, 50, "你");
        Drawing wo = new Drawing(account, 100, "wo");

        you.start();
        wo.start();
    }
}

//账户
class Account {
    int money; //余额
    String name;  //卡名

    public Account(int money, String name) {
        this.money = money;
        this.name = name;
    }
}

//银行：模拟取款
class Drawing extends Thread {
    Account account;  //账户
    int drawingMoney;  //取了多少钱
    int nowMoney;   //现在手里有多少钱

    public Drawing(Account account, int drawingMoney, String name) {
        super(name);
        this.account = account;
        this.drawingMoney = drawingMoney;
    }



    // synchronized 默认锁的是this.
    //取钱
    @Override
    public void run() {
        //判断有没有钱

        //锁的[对象]是变化的量，增删改，，，不需要 查
        synchronized (account) {
            if (account.money - drawingMoney < 0) {
                System.out.println(Thread.currentThread().getName() + "钱不够，取不了");
                return;
            }


            //sleep可以放大问题的发生性
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            //卡内余额 = 余额 - 取的钱
            account.money = account.money - drawingMoney;
            //手里的钱
            nowMoney = nowMoney + drawingMoney;

            System.out.println(account.name + "余额为：" + account.money);

            //Thread.currentThread().getName() = this.getName()
            System.out.println(this.getName() + "手里的钱：" + nowMoney);
        }
    }

}